splitenz writes: "I forward this file to you for review. Please open and view it."

As a ploy to get a hapless EMC recruiter to open up a booby trapped Excel spreadsheet, it may not be the most sophisticated piece of work. But researchers at F-Secure believe that it was enough to break into one of the most respected computer security companies on the planet, and a first step in a complex attack that ultimately threatened the security of major US defense contractors including Lockheed Martin, L-3, and Northrop Grumman.